他们用柠檬汁、盐或其他东西来清洁牙齿。
They used lemon juice, salt or other things to clean their teeth.
天然清洁剂如牛奶，柠檬本身就是有效的天然化妆品。
Natural cleansers like milk and lemon are effective natural cosmetics in themselves.
柠檬酸是一种天然温和的漂白物，并对清洁和去味有奇效。
The acid in the lemon juice is a natural mild bleach and is effective in cleaning and deodorizing.
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